3. 36 Hours. He is refusing to adjourn.

UPDATE: 3:11 p.m. -- The Senate will reform the filibuster within the next day and a half -- whether Republicans go along or not, Senate Majority Leader Harry Reid (D-Nev.) said Tuesday afternoon.

"I hope that within the next 24 to 36 hours we can get something we agree on. If not, we're going to move forward on what I think needs to be done," Reid told reporters. "The caucus will support me on that," he added.

He specified that he has the 51 votes he needs to proceed on a Democratic plan, indicating he's willing to pursue the "constitutional option" of changing the rules without the usual two-thirds vote. Previously, a number of senior Democrats had professed reluctance to change the rules with a simple majority, saying they feared it would set a dangerous precedent. Opponents have called the tactic the "nuclear option."